For the aspiring solar adopter, reading the 2021 issues offers a fascinating lesson in how fast the technology matures (600W micro-inverters then are now 800W legal standards). For the veteran Sonnenfreund , it is a scrapbook of the year the hobby went mainstream.
Collectors track the magazine’s evolution from its early post-war issues (published by Richard Danehl’s Verlag) to its current glossy format. Sonnenfreunde Magazine 2021
In 2021, advertisers included:
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